Factorise: x² + 10x + 25

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• A (x+5)(x+5)
• B (x+4)(x+5)
• C (x+5)(x+7)
• D (x+3)(x+5)

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Answer: A. (x+5)(x+5)

Split the middle term: x² + 5x + 5x + 25 = x(x + 5) + 5(x + 5) = (x + 5)(x + 5).

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